Neutrino seesaw models at one-loop matching: Discrimination by effective operators

TL;DR

This paper analyzes one-loop matching in neutrino seesaw models, highlighting how different models induce distinct effective operators, affecting electroweak symmetry breaking and enabling model discrimination through collider and precision experiments.

Contribution

It provides a comprehensive one-loop matching analysis of type-I, -II, and -III seesaw models, revealing their unique dimension-6 operators and implications for electroweak symmetry breaking.

Findings

Different seesaw models induce distinct dimension-6 operators.

Threshold effects can trigger radiative electroweak symmetry breaking in type-II.

Effective operators enable model discrimination at colliders and precision experiments.

Abstract

Using the functional method, one-loop matching of the type-I, -II and -III seesaw models are investigated and the results are presented in both the Green's and the Warsaw bases. Although these models generate the same dimension-5 Weinberg operator, they could induce quite different types of dimension-6 effective operators that can be utilized for model discrimination. We also find the threshold effects from one-loop matching could be significant, which turn out to allow triggering electroweak symmetry breaking radiatively in type-II seesaw while forbid that in type-I/-III models. An analytical criterion for such radiative symmetry breaking is also derived in type-II seesaw. Finally, we investigate the indirect signatures from different types of dimension-6 operators at high-energy colliders, low-energy precision experiments and forward physics facilities for model discrimination.